The species " C . macellaria " has pale setulae on the fronto-orbital plate outside the row of frontal bristles, while " C . hominivorax " has dark setulae on the fronto-orbital plate outside the row of frontal bristles.
12.
The lateral margin of the anterior surface is serrated, and articulates with the lamina papyracea of the ethmoid, completing the posterior ethmoidal cells; the lower margin articulates with the orbital process of the palatine bone, and the upper with the orbital plate of the frontal bone.
